Textiles. Determination of pH of aqueous extract

2015 ◽  
Keyword(s):  
Aqueous Extract

In vitro determination of prebiotic potential of aqueous extract of horse chestnut by-product

2019 ◽  
Vol 19 ◽  
pp. 100190
Author(s):  
Joanna Przyborska ◽  
Michael C. Hall ◽  
Mary Concannon
Keyword(s):  
Aqueous Extract ◽  
Horse Chestnut

AN ACCURATE METHOD FOR THE ESTIMATION OF LOW CONCENTRATIONS OF DEXTRAN IN PLASMA

1957 ◽  
Vol 35 (6) ◽  
pp. 383-390 ◽  
Author(s):  
Robert E. Semple
Keyword(s):  
Aqueous Extract ◽  
Accurate Method ◽  
Protein Precipitation ◽  
In Vitro Tests ◽  
Plasma Samples ◽  
Carbohydrate Concentration ◽  
Low Concentrations ◽  
Standard Deviations

A method is presented for the determination in plasma of small (50–150 mg./100 ml.) amounts of dextran. The procedure, which requires between 3 and 4 hours, consists of protein precipitation, glucose removal by dialysis, and the determination of the carbohydrate concentration of the resulting aqueous extract by a modified anthrone technique. Results of in vitro tests show that average dextran recovery is essentially 100% and that standard deviations in recovery range from 1.7 to 2.5% depending upon the dextran concentration. Deviations are reduced to a range of 1.4–1.7% by the use of duplicate plasma samples.

Cerium nanoparticles synthesized using aqueous extract of Centella asiatica: characterization, determination of free radical scavenging activity and evaluation of efficacy against cardiomyoblast hypertrophy

RSC Advances ◽  
2015 ◽  
Vol 5 (27) ◽  
pp. 21074-21083 ◽  
Author(s):  
Vandana Sankar ◽  
Palayyan SalinRaj ◽  
Raj Athira ◽  
Rema Sreenivasan Soumya ◽  
Kozhiparambil Gopalan Raghu
Keyword(s):  
Free Radical ◽  
Cellular Uptake ◽  
Aqueous Extract ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Centella Asiatica ◽  
Free Radical Scavenging ◽  
Calcium Overload ◽  
Scavenging Activity

Cerium nanoparticles synthesized usingCentella asiaticawere characterized, and tested for radical scavenging activities, cellular uptake, cytotoxicity and efficacy against cardiomyoblast hypertrophy and calcium overload.

scholarly journals CONVERSION CALCIUM CARBONATE AS FILLER OF THERMOPLASTICS

2017 ◽  
Vol 60 (4) ◽  
pp. 100 ◽  
Author(s):  
Lyudmila V. Rudakova ◽  
Sabukhi I. Niftaliev ◽  
Ekaterina S. Natarova
Keyword(s):  
Calcium Carbonate ◽  
Aqueous Extract ◽  
Chemical Properties ◽  
Total Content ◽  
Component Composition ◽  
Water Soluble ◽  
Preliminary Heat Treatment ◽  
Crushed Material ◽  
Wide Range

X-ray and laser diffraction methods were used to determine basic physical and chemical properties of conversion calcium carbonate. It was found that for obtaining standard product for use as a filler, it is necessary to regrind it. The results of dispersion changes in conversion chalk (chalk stone) were expressed in terms of median (D50), maximum (D98) and minimum (D10) particle size. It was established that during the grinding process a transition occurs from the initial odiomodal distribution to the bimodal distribution, which is characterized by a sufficiently wide range of the sizes of the particles of the crushed material. The optimum parameters of grinding were determined. With the help of SEM method, used before and after grinding of conversion calcium carbonate, it was established that the particles of primary material are represented by polycrystalline dense aggregates of spherical shape, due to mass crystallization of calcium carbonate at the condition of high supersaturation according to polynuclear growth mechanism. The component composition of water-soluble impurities was quantitatively estimated on the basis of the determination of the content of nitrate N-NO3- and ammonium N-NH4+ forms of nitrogen in various forms of presence-total, bound, water-soluble, and additional determination of the Ca2+ content of calcium ions in aqueous extract. It has been experimentally established that preliminary heat treatment of conversion calcium carbonate allows to significantly reduce the total content of water-soluble substances in the ground product by more than 5 times: at a temperature of 400 ° C, the degree of removal by NH4+ and NO3- ions is ~ 40-50%, and at 500 ° C - ~ 60% for NO3- and ~ 90% for NH4+. The estimation of the possibility of using the obtained product as a filler of polymer composite materials was done comparing the main parameters (CIELab  (W and L) color characteristics, bulk density, dispersed composition, specific surface, pH of aqueous extract) with known finely ground natural chalk and microcalcite. Forcitation:Rudakova L.V., Niftaliev S.I., Natarova E.S. Conversion calcium carbonate as filler of thermoplastics. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 4. P. 100-107.

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